28143307 has 2 divisors, whose sum is σ = 28143308. Its totient is φ = 28143306.

The previous prime is 28143287. The next prime is 28143317. The reversal of 28143307 is 70334182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28143307 - 2¹⁵ = 28110539 is a prime.

It is not a weakly prime, because it can be changed into another prime (28143317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071653 + 14071654.

It is an arithmetic number, because the mean of its divisors is an integer number (14071654).

Almost surely, 2^28143307 is an apocalyptic number.

28143307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28143307 is an equidigital number, since it uses as much as digits as its factorization.

28143307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 28143307 is about 5305.0265786328. The cubic root of 28143307 is about 304.1760687988.

Adding to 28143307 its reverse (70334182), we get a palindrome (98477489).

The spelling of 28143307 in words is "twenty-eight million, one hundred forty-three thousand, three hundred seven".